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ABSTRACT

A FOUR-SPEED RATIO POWER TRANSMISSION MECHANISM FOR USE IN AN AUTOMOTIVE VEHICLE DRIVELINE COMPRISING THREE SIMPLE PLANETARY GEAR UNITS, EACH GEAR UNIT HAVING A RING GEAR, A SUN GEAR AND A PLANETARY CARRIER, THE SUN GEAR OF THE FIRST AND SECOND GEAR UNITS BEING COMMON, THE RING GEAR OF THE SECOND AND THIRD GEAR UNITS BEING COMMON AND FIVE FRICTION TORQUE ESTABLISHING DEVICES FOR CONTROLLING THE RELATIVE MOTION OF THE ELEMENTS OF THE GEAR UNITS THEREBY PROVIDING FOUR FORWARD DRIVING SPEED RATIOS AND A SINGLE REVERSE SPEED RATIO WHEREIN THE RATIO CHANGE BETWEEN THE TWO HIGHEST RATIOS IS OF A REDUCED MAGNITUDE AND THE TORQUE RATIOS AVAILABLE DURING OPERATION IN THE LOW SPEED RANGE AND IN REVERSE ARE RELATIVELY HIGH

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 18, 1969, 869 0.G. 687.7.ihe abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications nrenvailable to vthe public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED OCTOBER 80, 1973 A four-speed ratio power transmission mechanism for use in an automotive vehicle driveline comprising three simple planetary gear units, each gear unit having a ring gear, a sun gear and a planetary carrier, the sun gear of the first and second gear units being common, the ring gear of the second and third gear units being common and five friction torque establishing devices for controlling the relative motion of the elements of the gear units thereby providing four forward driving speed ratios and a single reverse speed ratio wherein the ratio change between the two highest ratios is of a reduced magnitude and the torque ratios available during operation in the low speed range and in reverse are relatively high.

Oct. 30, 1973 KEPNER ETAL T915,010

FOUR-SPEED AUTOMATIC TRANSMISSION MECHANISM HAVING THREE SIMPLE PLANETARY GEAR UNITS Filed June 5, 1972 2 Sheets-Sheet 1 it I I"? I y JZW i /Z J/Z 12/ 07%? (awn 671 67 E- 7L;;I+ ;g)(/+;; 14 1x144 3. 1 gy/+55) 441 144 2/1 5 mg; [4% x44 {ax/.44 1/1 TORQUE m5? 5/ w a'iiiiii .44 MM 41/4; 2.41m 9,5; w [411 w 1 44/41 0 0 0 14mm; 44 u 3 M 3/5 0 0 0 5% MA m 3 5 4 M12 .70 1 .m 3/5 $25.37; ,42 .35 3/5 2? 0 0 0 7/5 5752/; 1/5 4/511;

F F1 f -1 SPEED M1 J52 2 3 -51 4/ p 4/ 0 ,7!

2 M5 M5 0 47 M5 0 y 5 0 J55 INVENTORS. 4/177 7 flap 7719 7 

